Journal of the Japan Society of Precision Engineering

[title in Japanese]

[in Japanese]

1967 Volume 33 Issue 395 Pages 765-773
Published: December 05, 1967
Released on J-STAGE: June 30, 2009

DOIhttps://doi.org/10.2493/jjspe1933.33.765

JOURNAL FREE ACCESS

Download PDF (1704K)
Dressing of A Metal Bonded Diamond Wheel in Grinding Ceramics

Abrasive Machining of Ceramics (5)

Yuzo ARAI, Ichiro IDA, Mitsutoshi FUKUDA

1967 Volume 33 Issue 395 Pages 774-781
Published: December 05, 1967
Released on J-STAGE: June 30, 2009

DOIhttps://doi.org/10.2493/jjspe1933.33.774

JOURNAL FREE ACCESS

Show abstractHide abstract

In view of the importance in dressing a metal bonded diamond wheel for obtaining high reproducibility in grinding ceramics, grinding force, number and height of cutting edges in grains and redress life being pursued, the following results are obtained : (1) Comparing the method 'GVS' that a GC stick is ground with a diamond wheel and the method 'GF', where cutting edges on diamond grains are produced by scratching using a GC wheel, with the method 'GM', the latter is more effective in producing cutting edges through microfractur-ing, because of the driving of both the wheels in the opposite direction under a similar peripheral speed. (2) Many effective cutting edges are obtained from the condition that the grain size of a dressing wheel is finer than that of a diamond wheel. (3) Height of cutting edges on grains is one-tenth to one-twentieth of a diamond grain diameter, leading to the rare release of grains. (4) Effectively acting graing are 10 to 25% of the whole grains along a wheel width in cm², and their number is greatest in the method 'GM', (5) A coarser dressing wheel is better for redress life, but worse for the number of cutting edges.

View full abstract

Download PDF (1574K)
Study for Improvement of Energy Efficiency in Hydro-Spark Forming

Masami OMORI, Tomoichi INOUE, Keiji OKUSHIMA

1967 Volume 33 Issue 395 Pages 782-787
Published: December 05, 1967
Released on J-STAGE: February 16, 2010

DOIhttps://doi.org/10.2493/jjspe1933.33.782

JOURNAL FREE ACCESS

Show abstractHide abstract

In order to perform hydro-spark forming at a maximum efficiency of energy, (1) conditions of spark gap, (2) charged voltage on the capacitor bank and (3) configuration of the forming chamber should be selected properly. Present study took variations, in those Parameters in hydro-spark forming experiments, so that optimum conditions were derived.
By adjusting above parameters to the optimum setting, the energy efficiency of the process without the exploding wire was improved from 1% to 2.6%, with the exploding wire, from 2.6% to 11.5%.

View full abstract

Download PDF (799K)
Study on Ultra High Speed Cutting (5th Report)

Thermal Consideration on the Configuration of Tool Wear

Yoshinobu TANAKA, Hideo TSUWA, Masanori KITANO

1967 Volume 33 Issue 395 Pages 788-794
Published: December 05, 1967
Released on J-STAGE: June 30, 2009

DOIhttps://doi.org/10.2493/jjspe1933.33.788

JOURNAL FREE ACCESS

Show abstractHide abstract

In a previous paper, it was shown that the temperature played a very significant role in the wear of cutting tool at the ultra high speed. It seems that a point of wide difference between the ultra high speed cutting and conventional cutting is the temperature distribution in shear zone.
This experiment was made to analyze the effects of the temperature distribution on the configuration of tool wear. High speed steel tool and 60-40brass (work material) were used in the test under different cutting conditions at speed range of 1000-7000m/min.
As the results, in the ultra high speed cutting, it was found that the effect of tool face temperature on end face was very small, and the configuration of tool wear was significantly influenced by temperature distribution on shear plane.

View full abstract

Download PDF (1022K)
On the Fracture of Abrasives in Blasting

Shiro YAMADA, Kunio YANAGISHIMA

1967 Volume 33 Issue 395 Pages 795-801
Published: December 05, 1967
Released on J-STAGE: February 16, 2010

DOIhttps://doi.org/10.2493/jjspe1933.33.795

JOURNAL FREE ACCESS

Show abstractHide abstract

The four kinds of #120 abrasives of Aluminum oxide, Silicon carbide, Single Crystal (A) and Emery are blasted in dry method to mild steel plates SPC-1 through the nozzle of the liquid honing gun (Jet : I. D. 3.17mm, Nozzle : I. D. 6.35mm) under the conditions of 5kg/cm² blasting pressure, 90mm blasting distance and 90° blasting angle (perpendicular to the blasted surface). Abrasives repeatedly blasted 100 times are observed microscopically and the friability of the abrasives is discussed through the distribution of diameter obtained by measuring the settling velocity. The experimental results obtained are as follows:
1) Blasting abrasives are spread conically, and the velocity, the mean diameter and the density of blasted abrasives are not uniform on the blasted area, 30mm in diameter. Namely, all of these values are decreased in the direction of diameter from the centre to the periphery. Therefore, the surface roughness become rough more and more in the direction from the periphery to the centre of the blasted surface. This makes it difficult to obtain the uniform roughness of the blasted surface.
2) All kinds of abrasives used in the present experiment, especially, those of Aluminum oxide and Singl Crystal (A) are apt to be fractured until the 4th or 5th blasting due to the unstable structure introduced during the manufacturing process. Thereafter each abrasive shows almost constant fracture strength ranging in a decreasing order of strength, those of Aluminum oxide, Single Crystal(A) (little difference observed between these two), Siliconcarbide and Emery.

View full abstract

Download PDF (1628K)
Dynamic Analysis on the Barrel Cam Type Index Table (Part 1)

Rotating Direction of the Barrel Cam

Hiroshi MAKINO

1967 Volume 33 Issue 395 Pages 802-808
Published: December 05, 1967
Released on J-STAGE: June 30, 2009

DOIhttps://doi.org/10.2493/jjspe1933.33.802

JOURNAL FREE ACCESS

Show abstractHide abstract

Because of the circular motion of the follower(s), the movement of the follower in a right angle barrel cam mechanism is different from the cam profile curve. The difference is not negligible when the number of index is small and the pressure angle is large.
The cam allows two rotating directions. When the cam rotates in the "out-to-in " or " keylock " direction, the acceleration time is decreased and the deceleration time is increased, while the peak value of the pressure angle appears during the acceleration time. In the reverse direction, it is quite the contrary and the peak pressure angle appears during the deceleration time. In order to prevent the vibration of the table after indexing, the " out-to-in " direction is better.

View full abstract

Download PDF (1011K)
[title in Japanese]

[in Japanese], [in Japanese], [in Japanese], [in Japanese]

1967 Volume 33 Issue 395 Pages 809-814
Published: December 05, 1967
Released on J-STAGE: June 30, 2009

DOIhttps://doi.org/10.2493/jjspe1933.33.809

JOURNAL FREE ACCESS

Download PDF (1079K)
[title in Japanese]

[in Japanese]

1967 Volume 33 Issue 395 Pages 815-818
Published: December 05, 1967
Released on J-STAGE: June 30, 2009

DOIhttps://doi.org/10.2493/jjspe1933.33.815

JOURNAL FREE ACCESS

Download PDF (614K)
[title in Japanese]

[in Japanese]

1967 Volume 33 Issue 395 Pages 819-829
Published: December 05, 1967
Released on J-STAGE: June 30, 2009

DOIhttps://doi.org/10.2493/jjspe1933.33.819

JOURNAL FREE ACCESS

Download PDF (2206K)
[title in Japanese]

[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...

1967 Volume 33 Issue 395 Pages 830-837
Published: December 05, 1967
Released on J-STAGE: June 30, 2009

DOIhttps://doi.org/10.2493/jjspe1933.33.830

JOURNAL FREE ACCESS

Download PDF (1748K)

Register with J-STAGE for free!